package cc.openhome;
import java.util.*;
public class Average3{
    public static void main(String[] args) {
        Scanner console =new Scanner (System.in);
        double sum=0;
        int count =0;
        while (true){
            try {
                int number=console.nextInt();
                if(number==0){
                    break;

                }
                sum+=number;
                count++;

            }catch (InputMismatchException ex){
                System.out.printf("略过非整数输入:%s%n",console.next());
            }
        }
        System.out.printf("平均%.2f%n",sum/count);
    }
}